Paypal issue

I verified all the information to set up the Paypal gateway with application ID and all API.
I retreive all API information from my Paypal account and when I try to submit a “contribution” I have this issue:

Fatal error: Uncaught exception ‘Exception’ with message ‘Preapproval failed: Authentication failed. API credentials are incorrect.’ in /homepages/20/d336430673/htdocs/noartlimit/wp-content/themes/funding_press/funding/paypal.php:100 Stack trace: #0 /homepages/20/d336430673/htdocs/noartlimit/wp-content/themes/funding_press/funding/funding.php(347): F_PayPal->get_auth_url(Object(WP_Post), Object(WP_Post), Object(WP_Post)) #1 [internal function]: F_Controller->action_template_redirect(”) #2 /homepages/20/d336430673/htdocs/noartlimit/wp-includes/plugin.php(505): call_user_func_array(Array, Array) #3 /homepages/20/d336430673/htdocs/noartlimit/wp-includes/template-loader.php(12): do_action(‘template_redire…’) #4 /homepages/20/d336430673/htdocs/noartlimit/wp-blog-header.php(16): require_once(‘/homepages/20/d…’) #5 /homepages/20/d336430673/htdocs/noartlimit/index.php(17): require(‘/homepages/20/d…’) #6 {main} thrown in /homepages/20/d336430673/htdocs/noartlimit/wp-content/themes/funding_press/funding/paypal.php on line 100